changing button icons

I was wondering if I could change the ps3 button icons ( in Icons folder ) I don't usually use ps3 controllers and the button prompts usually confuse me. Could I change the icons in the folder and have it affect games that I play? Say I wanted xbox360 prompts where I find the pngs for them? Do games use custom button prompts and could I mod them to include other prompts? Any help is appreciated, thanks.